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fix(round-robin-pool): use live clients length after TTL eviction#5070

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fix(round-robin-pool): use live clients length after TTL eviction#5070
deepview-autofix wants to merge 1 commit intonodejs:mainfrom
deepview-autofix:deepview/e8086c3721

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The round-robin dispatcher loop captured this[kClients].length before iterating, but kRemoveClient can shrink the array during iteration when multiple clients are evicted by TTL. The stale length caused the modulus to point past the new array bounds, so this[kClients][this[kIndex]] returned undefined and the next property access (.ttl or [kNeedDrain]) threw a TypeError.

Read the length dynamically on each iteration and bail out once the array is empty so the loop always indexes into valid entries.

The round-robin dispatcher loop captured `this[kClients].length` before
iterating, but `kRemoveClient` can shrink the array during iteration when
multiple clients are evicted by TTL. The stale length caused the modulus
to point past the new array bounds, so `this[kClients][this[kIndex]]`
returned `undefined` and the next property access (`.ttl` or
`[kNeedDrain]`) threw a TypeError.

Read the length dynamically on each iteration and bail out once the
array is empty so the loop always indexes into valid entries.

Co-Authored-By: Claude <noreply@anthropic.com>
Co-Authored-By: DeepView Autofix <276251120+deepview-autofix@users.noreply.github.com>
Co-Authored-By: Nikita Skovoroda <chalkerx@gmail.com>
Signed-off-by: Nikita Skovoroda <chalkerx@gmail.com>
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pool logic still appears to be broken (both here and on main) and it just hangs in some conditions

will revisit later

@deepview-autofix deepview-autofix marked this pull request as draft April 19, 2026 18:58
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ChALkeR commented Apr 19, 2026

I don't think RoundRobinPool works at all, the problem seems to be deeper

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.12%. Comparing base (2a07f01) to head (9717d74).

Additional details and impacted files
@@            Coverage Diff             @@
##             main    #5070      +/-   ##
==========================================
+ Coverage   93.09%   93.12%   +0.02%     
==========================================
  Files         110      110              
  Lines       35788    35788              
==========================================
+ Hits        33318    33326       +8     
+ Misses       2470     2462       -8     

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3 participants